Israeli ambassador: 'Not making any calls' on Syria

4/28/13 10:01 AM EDT

The Israeli ambassador to the U.S. said on Sunday he was "not making any calls" on whether recent intelligence reports that the Syrian government might have used chemical weapons on rebels should prompt international action.

"Our military has made an assessment and that assessment looks like there's a high probability of usage," Ambassador Michael Oren said on "Fox News Sunday." "That's a very similar assessment made by Britain, by France and, yes, by the United States. It's not definitive of proof, of course."

Oren declined to say whether he believes President Barack Obama's red line had been crossed — saying Israel has its own red lines, which include Syrian attempts to transfer weapons to Lebanon.

"This is an American decision," he said. "We're not recommending any policy, other than one exception: If the United States decides to arm Syrian rebels with lethal weaponry, not just defensive weaponry, that those weapons and those rebels be very carefully vetted."